Michelangelo van Dam has put together a book review of the Addison-Wesley/Pearson book "Zend Studio for Eclipse - Developer's Guide":

This book is in my opinion a beginner's guide into using ZSE, aiming at PHP developers that have a knowledge of general concepts like versioning, debugging and refactoring. I personally was hoping to see advanced settings to tune the IDE into a powerful developer's tool, but it was merely a basic explanation with the correct terminology for a product that I've been using well over two years now (yes, I was also beta-tester for it).

He keeps it short but does note that the book can be a good asset for those just getting into Eclipse but if you're already past that level, it wouldn't hold much for you.